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TATA MOTORS Ltd.
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author.
Restraints Control Module (SRS / Airbag) -ECU Replacement Procedure
Version: 4.0
Date: 29-10--2016
Author: Airbag CoC, ERC
Page: 1 of 7
SRS (Airbag) ECU replacement procedure in service
1. Remove the central console housing in the car.
2. Remove the two wiring harness connectors (first chamber A & then Chamber B) from Airbag
ECU.
3. Remove the 3 mounting screws of Airbag ECU.
4. Replace the existing Airbag ECU with a new one
(Compare the ECU Assembly number & Part
number from ECU label of both the ECU’s. The new ECU should have the same Assembly
number & Part number as per the existing Airbag ECU label in the vehicle).
5. Fix the ECU on mounting studs & tighten the mounting screws. Tightening torque for fixing of
ECU MA = 9 ± 1.5 Nm. (Please refer to “
ECU offer drawing.pdf
” or Look up table in service tool
for the mounting direction of SRS ECU).
6. Connect the two wiring harness connectors to the Airbag ECU. Please ensure the correct fitment
of the wiring harness connectors (Connector coding D (blue) & C (brown)) connected to chamber
A & B respectively.
Please ensure the locking sound for both the Airbag ECU connectors.
(Please refer to “
ECU offer drawing.pdf
” for the connector pin details)).
7. Connect the Service tool to vehicle OBD connector.
8. Turn ON Ignition, Clear the DTC’s and Check for DTC’s in the new airbag ECU.
9. Read VC and VIN (Vehicle Identification Number) from IC or BCM or EMS ECU of the same
vehicle.
10. Read Assembly/ Container number from ECU ($22 72 34) and compare it with server data.
11. Check the parameterization part number as per VC from
PLM
server or from the look up table.
Note
:
Unique Parameterization number has been defined ensuring correct configuration and
required Calibration for defined VC.
Look up
table shall be flashed on service tool window to read
the required ECU details (Assembly number, Parameterization number and CAL parameter ID) for
respective VC.